1 files changed, 43 insertions, 0 deletions
diff --git a/third_party/rust/darling_macro/src/lib.rs b/third_party/rust/darling_macro/src/lib.rs
new file mode 100644
index 0000000000..de9709fb73
--- /dev/null
+++ b/third_party/rust/darling_macro/src/lib.rs
@@ -0,0 +1,43 @@
+// This is needed for 1.31.0 to keep compiling
+extern crate proc_macro;
+
+use darling_core::{derive, Error};
+use proc_macro::TokenStream;
+use syn::parse_macro_input;
+
+#[proc_macro_derive(FromMeta, attributes(darling))]
+pub fn derive_from_meta(input: TokenStream) -> TokenStream {
+    derive::from_meta(&parse_macro_input!(input)).into()
+}
+
+#[proc_macro_derive(FromMetaItem, attributes(darling))]
+pub fn derive_from_meta_item(_input: TokenStream) -> TokenStream {
+    Error::custom("darling::FromMetaItem has been replaced by darling::FromMeta")
+        .write_errors()
+        .into()
+}
+
+#[proc_macro_derive(FromAttributes, attributes(darling))]
+pub fn derive_from_attributes(input: TokenStream) -> TokenStream {
+    derive::from_attributes(&parse_macro_input!(input)).into()
+}
+
+#[proc_macro_derive(FromDeriveInput, attributes(darling))]
+pub fn derive_from_input(input: TokenStream) -> TokenStream {
+    derive::from_derive_input(&parse_macro_input!(input)).into()
+}
+
+#[proc_macro_derive(FromField, attributes(darling))]
+pub fn derive_field(input: TokenStream) -> TokenStream {
+    derive::from_field(&parse_macro_input!(input)).into()
+}
+
+#[proc_macro_derive(FromTypeParam, attributes(darling))]
+pub fn derive_type_param(input: TokenStream) -> TokenStream {
+    derive::from_type_param(&parse_macro_input!(input)).into()
+}
+
+#[proc_macro_derive(FromVariant, attributes(darling))]
+pub fn derive_variant(input: TokenStream) -> TokenStream {
+    derive::from_variant(&parse_macro_input!(input)).into()
+}